gimme seinen romance recommendations & seinen in general none of that sappy shit
not a big romance person so I can only recommend Seinen but you should read Hellsing, Usogui or Oyasumi Punpun
if you want a good Shounen that is underrated look at Akumetsu
the only "romance seinen" I know is Smoking Behind the Supermarket with You but mostly because it feels a lot more mature and grounded in reality as a romance compared to others, it isn't a Seinen with Romance though